81360939 has 8 divisors (see below), whose sum is σ = 118343232. Its totient is φ = 49309640.

The previous prime is 81360931. The next prime is 81360943. The reversal of 81360939 is 93906318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81360939 - 2³ = 81360931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81360897 and 81360906.

It is not an unprimeable number, because it can be changed into a prime (81360931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232709 + ... + 1232774.

It is an arithmetic number, because the mean of its divisors is an integer number (14792904).

Almost surely, 2^81360939 is an apocalyptic number.

81360939 is a deficient number, since it is larger than the sum of its proper divisors (36982293).

81360939 is a wasteful number, since it uses less digits than its factorization.

81360939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465497.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 81360939 is about 9020.0298779993. The cubic root of 81360939 is about 433.3165906089.

The spelling of 81360939 in words is "eighty-one million, three hundred sixty thousand, nine hundred thirty-nine".